This is an old revision of this page, as edited by Incnis Mrsi(talk | contribs) at 21:00, 23 March 2010(there is no definition of s.c.f. on some set here, and s.c.f. at one point is the same than symmetric derivative). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.Revision as of 21:00, 23 March 2010 by Incnis Mrsi(talk | contribs)(there is no definition of s.c.f. on some set here, and s.c.f. at one point is the same than symmetric derivative)